\title{Using Mathematics to Understand Our World}

Oct 11, 2003 · Suppose some quantity can be modeled as q(t)=qo ert. There is a rule called The Rule of 70 which says that the doubling time is approximately 70/r. Where does this come from? How accurate is it? Exponential Decay. In most of our previous examples, the exponent was always positive, but it can be negative, too. Task 1: Graph the function . What ... ................
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